SuDS pond bank stabilisation

SuDS ponds stabilisation and vegetation establishment

Reducing erosion and sedimentation during the construction of a housing estate.


The area which required stabilisation was the SuDS pond which will take runoff water from the newly built estate.
Sustainable urban Drainage Systems (SuDS) are an important water runoff management system in all new housing developments.

We were brought in to stabilise the bare soils around and within the balancing ponds at the SuDS on a housing development in Sussex.
The main objective is to minimise and trap soil from being displaced by rain impact and then transported within the surface water flow, off site and into streams and a lower lake.

The solution included:

  • Initial stabilisation, using biodegradable rolled erosion-controlled blankets, this was a combination of fully biodegradable matting and wooden pegs
  • Creation of a sump within the pond to trap sediment by building a retaining features using coir rolls and biodegradable net
  • Once the conditions allowed the bank sides were hydroseeded through and over the biodegradable nets
  • The pond ecology was established using pre-vegetated coir rolls, providing for quick growth and immediate reduction in the erosive potential of the water entering the system

There were significant benefits to the client

  • Significant carbon saving
  • Financial savings
  • Quick application
  • Rapid vegetation establishment
  • Root stability in 6 months
  • No top soil brought on site, reducing risk and cost
  • Ease of working with other contractors
  • Completed quickly

Additions for Soil

As soils are site specific, TerrAffix Soil Solutions provide several additions that can further improve conditions for soil function and plant growth. For more complex sites we can provide bespoke solutions based on soil analysis to ensure that the best-fit solution for your site is achieved.

We provide additional products that support vegetation establishment, including fertiliser, slow-release inorganic nutrients, trace elements, inoculents and biochars:

  • Mycorrhizae – a biological addition that supports the plant to access inorganic nutrients from within the soil environment;
  • Liming agent – provides a source of calcium carbonate, calcium phosphate and micronutrients for use on sites with acidified soil;
  • Fertiliser – an organic, readily available source of NPK (8:4:2) derived from mycelial fungi;
  • Amended biochar – provides opportunities for nutrient exchange, water retention and microbiological activity;
  • Tackifier – a product for use on extreme slopes where additional temporary adhesion may be required.


TerrAffix-HydraMulch is a 100% natural hydraulically applied erosion control system for extreme slopes and embankments, land reclamation and rough or polluted ground.

We supply and apply all our products.

The recycled eco-fibre blend of TerrAffix-HydraMulch establishes germination and promotes vegetation growth for permanent erosion control far more quickly than standard hydroseeding or Rolled Erosion Control Products.

TerrAffix-HydraMulch can reduce topsoil depth and can remove the requirement for any topsoil at all if used in conjunction with TerrAffix-Hydrasoil over a suitable substrate.